t1 = ('aa', 'bb', 'cc', 'bb')

# t1[0] = 'aaa' #TypeError: 'tuple' object does not support item assignment

t2 = ('aa', 'bb', ['cc', 'dd'])
# print(t2[2]) # ['cc','dd']
# print(t2[2][0]) #cc
t2[2][0] = 'TOM'
print(t2)  # ('aa', 'bb', ['TOM', 'dd'])
